Iowa Code § 335.16: Decision.

In exercising the powers in section 335.15, the board of adjustment may, in conformity with the provisions of this chapter, reverse or affirm, wholly or partly, or may modify the order, requirement, decision, or determination appealed from and may make such order, requirement, decision, or determination as ought to be made, and to that end shall have all the powers of the officer from whom the appeal is taken.